By Alex Sosnowski, AccuWeather senior meteorologist
As heat holds on and humidity builds in the eastern United States, a slow-moving swath of drenching showers and thunderstorms will advance from the Midwest to the Eastern Seaboard and eventually stall as the week progresses.
The storms will tend to focus in a swath from Louisiana to Michigan and southern Ontario into Monday night. The major cities of Detroit; Indianapolis; St. Louis; Cincinnati; Little Rock, Arkansas; Memphis, Tennessee; Shreveport, Louisiana; and Houston are due for drenching downpours and locally gusty winds from the storms.
While widespread severe weather is not anticipated, the storms can pack enough rainfall to lead to localized incidents of urban and small stream flooding.
As the storms approach heavily populated areas, travel disruptions will increase with the potential for some roads to be blocked by rapidly rising water.
As the storms approach and pass over airports, airline delays are likely.
A small number of the storms can be robust enough to bring strong wind gusts which can break tree limbs and cause sporadic power outages.
Even though most of the gusty storms will occur between 3 and 9 p.m. local time, there can be some exceptions. In this pattern, downpours can occur anytime during the day and night as the core of the moisture approaches.
A cool front associated with the storms will make more forward progress across the northern tier as opposed to the Deep South.
On Tuesday, the main axis of showers and thunderstorms is forecast to extend from Louisiana to upstate New York, northern New England and southeastern Quebec.
It is likely to take until Wednesday afternoon and evening before the concentrated area of storms reaches the Interstate-95 corridor from Washington, D.C., to Baltimore, Philadelphia, Boston and New York City.
The storms will break the heat as they advance. However, high humidity may linger in the Deep South and near the Atlantic coast.
Toward the end of the week, the forward speed of the front will grind to a halt in the Southeast and is expected to greatly slow down in the coastal areas of the Northeast.
Showers and thunderstorms will continue to erupt along this frontal zone, especially in the humid air.
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Tropical moisture that includes an area of disturbed weather may also come into play. That disturbance is forecast to approach the Florida Peninsula late in the week.
The risk of localized flash flooding may linger for several days in the Southeast and at least into Friday in coastal areas of the mid-Atlantic.
For those heading to or already at the beach this week, the best bet for staying
While the Southeast and the immediate coastal areas of the Northeast are likely to remain unsettled and muggy at the end of the week, less humid air that invades the Midwest on Tuesday and Wednesday will reach the central Appalachians and northern New England on Thursday.
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